feat: snippet new

[FFXN]

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Summary

Screenshots

Before	After
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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods

[github-actions]

Pyrefly Diff

base → PR

--- /tmp/pyrefly_base.txt	2026-05-25 08:35:30.614991549 +0000
+++ /tmp/pyrefly_pr.txt	2026-05-25 08:35:16.666888290 +0000
@@ -26,8 +26,6 @@
    --> controllers/console/snippets/snippet_workflow.py:606:53
 ERROR Returned type `(ParamSpec(P)) -> Response | R` is not assignable to declared return type `(ParamSpec(P)) -> R` [bad-return]
   --> controllers/console/snippets/snippet_workflow_draft_variable.py:77:12
-ERROR Unexpected keyword argument `exclude_node_ids` in function `services.workflow_draft_variable_service.WorkflowDraftVariableService.list_variables_without_values` [unexpected-keyword]
-   --> controllers/console/snippets/snippet_workflow_draft_variable.py:106:17
 ERROR Object of class `MissingRouter` has no attribute `get` [missing-attribute]
   --> controllers/console/version.py:30:2
 ERROR Class member `EasyUIBasedGenerateTaskPipeline._application_generate_entity` overrides parent class `BasedGenerateTaskPipeline` in an inconsistent manner [bad-override-mutable-attribute]

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	45.55%	45.56%	+0.00%
Strict coverage	45.07%	45.07%	+0.00%
Typed symbols	23,615	23,616	+1
Untyped symbols	28,527	28,527	0
Modules	2624	2624	0